Bluz\Grid\Grid::getFilter PHP Method

    public function getFilter($column, $filter = null)
    {
        if (isset($this->filters[$column])) {
            if ($filter) {
                return $this->filters[$column][$filter] ?? null;
            } else {
                return $this->filters[$column];
            }
        } else {
            return null;
        }
    }